Over the years I have noticed that most alt season started as follows:
1. $BTC pumps first.
2. $ETH $BET & $LTC coin pumps next, leading indicators of the Alt season.
3. Big marketcap tokens next. Usually top 20 on CMC.
4. Then full blown Alt season.
It was the pattern last time and that is why it is expected to repeat and till now btc is moving big and eth is slowly following so yes the market is showing similar pattern how the big alt season unfolds this time is yet to be seen and i think we will have to wait for few more months to confirm the pattern.